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Not sure, but the 2 3/8" pipe may slide right into the 2 7/8". If that's the case it should be no problem, or just get some that does have a snug fit as aametalmaster said. You also might want to consider making 2 8' gates instead of one 16' gate. This would reduce to leverage and load on the hinges, making them last longer and less likely to fail.

I'd make the gate out of thinner wall pipe. 2-3/8 or 2-7/8 sounds like you might be using drill stem. That's going to get really heavy when suspended 16 feet out.

I have seen gates that heavy. The problem usually isn't with the hinge. It's with the support of the hinge post. With that much weight hung out, you'll need good support behind the post (in both the open and closed positions) to keep the post from leaning over.

I also like to add a grease fitting to all my hinges. Tight tolerances and good alignment on the hinge makes it operate smoothly, but any rust in a tight tolerance gap is asking for it to seize. Make it so rain can't get into the hinge and keep it full of grease and you'll have no problems.

I'd make the gate out of thinner wall pipe. 2-3/8 or 2-7/8 sounds like you might be using drill stem. That's going to get really heavy when suspended 16 feet out.

I have seen gates that heavy. The problem usually isn't with the hinge. It's with the support of the hinge post. With that much weight hung out, you'll need good support behind the post (in both the open and closed positions) to keep the post from leaning over.

I also like to add a grease fitting to all my hinges. Tight tolerances and good alignment on the hinge makes it operate smoothly, but any rust in a tight tolerance gap is asking for it to seize. Make it so rain can't get into the hinge and keep it full of grease and you'll have no problems.

The weight is what I was thinking when I suggested making two 8' gates instead of one 16' gate. Easier on the gate posts as well as hinges.

Find some 1" rod inside the 1" sch 40. Cap the sch 40 first then drop a 1" ball bearing in it then put a greasert in it. Polish up the rod with a flap wheel then insert it in the pipe. Weld it on and grease it up. No binding and no squeaking either and it opens like a dream.